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1/*
2 * Berkshire PCI-PC Watchdog Card Driver
3 *
4 * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
5 *
6 * Based on source code of the following authors:
7 * Ken Hollis <kenji@bitgate.com>,
8 * Lindsay Harris <lindsay@bluegum.com>,
9 * Alan Cox <alan@lxorguk.ukuu.org.uk>,
10 * Matt Domsch <Matt_Domsch@dell.com>,
11 * Rob Radez <rob@osinvestor.com>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
19 * provide warranty for any of this software. This material is
20 * provided "AS-IS" and at no charge.
21 */
22
23/*
24 * A bells and whistles driver is available from:
25 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
26 *
27 * More info available at
28 * http://www.berkprod.com/ or http://www.pcwatchdog.com/
29 */
30
31/*
32 * Includes, defines, variables, module parameters, ...
33 */
34
35#include <linux/module.h> /* For module specific items */
36#include <linux/moduleparam.h> /* For new moduleparam's */
37#include <linux/types.h> /* For standard types (like size_t) */
38#include <linux/errno.h> /* For the -ENODEV/... values */
39#include <linux/kernel.h> /* For printk/panic/... */
40#include <linux/delay.h> /* For mdelay function */
41#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
42#include <linux/watchdog.h> /* For the watchdog specific items */
43#include <linux/notifier.h> /* For notifier support */
44#include <linux/reboot.h> /* For reboot_notifier stuff */
45#include <linux/init.h> /* For __init/__exit/... */
46#include <linux/fs.h> /* For file operations */
47#include <linux/pci.h> /* For pci functions */
48#include <linux/ioport.h> /* For io-port access */
49#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
50#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
51#include <linux/io.h> /* For inb/outb/... */
52
53/* Module and version information */
54#define WATCHDOG_VERSION "1.03"
55#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
56#define WATCHDOG_NAME "pcwd_pci"
57#define PFX WATCHDOG_NAME ": "
58#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
59
60/* Stuff for the PCI ID's */
61#ifndef PCI_VENDOR_ID_QUICKLOGIC
62#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3
63#endif
64
65#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
66#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
67#endif
68
69/*
70 * These are the defines that describe the control status bits for the
71 * PCI-PC Watchdog card.
72 */
73/* Port 1 : Control Status #1 */
74#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
75#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */
76#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
77#define WD_PCI_RL2A 0x08 /* Relay 2 Active */
78#define WD_PCI_RL1A 0x10 /* Relay 1 Active */
79#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip /
80 reset */
81#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */
82/* Port 2 : Control Status #2 */
83#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
84#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */
85#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
86#define WD_PCI_PCMD 0x80 /* PC has sent command */
87
88/* according to documentation max. time to process a command for the pci
89 * watchdog card is 100 ms, so we give it 150 ms to do it's job */
90#define PCI_COMMAND_TIMEOUT 150
91
92/* Watchdog's internal commands */
93#define CMD_GET_STATUS 0x04
94#define CMD_GET_FIRMWARE_VERSION 0x08
95#define CMD_READ_WATCHDOG_TIMEOUT 0x18
96#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
97#define CMD_GET_CLEAR_RESET_COUNT 0x84
98
99/* Watchdog's Dip Switch heartbeat values */
100static const int heartbeat_tbl[] = {
101 5, /* OFF-OFF-OFF = 5 Sec */
102 10, /* OFF-OFF-ON = 10 Sec */
103 30, /* OFF-ON-OFF = 30 Sec */
104 60, /* OFF-ON-ON = 1 Min */
105 300, /* ON-OFF-OFF = 5 Min */
106 600, /* ON-OFF-ON = 10 Min */
107 1800, /* ON-ON-OFF = 30 Min */
108 3600, /* ON-ON-ON = 1 hour */
109};
110
111/* We can only use 1 card due to the /dev/watchdog restriction */
112static int cards_found;
113
114/* internal variables */
115static int temp_panic;
116static unsigned long is_active;
117static char expect_release;
118/* this is private data for each PCI-PC watchdog card */
119static struct {
120 /* Wether or not the card has a temperature device */
121 int supports_temp;
122 /* The card's boot status */
123 int boot_status;
124 /* The cards I/O address */
125 unsigned long io_addr;
126 /* the lock for io operations */
127 spinlock_t io_lock;
128 /* the PCI-device */
129 struct pci_dev *pdev;
130} pcipcwd_private;
131
132/* module parameters */
133#define QUIET 0 /* Default */
134#define VERBOSE 1 /* Verbose */
135#define DEBUG 2 /* print fancy stuff too */
136static int debug = QUIET;
137module_param(debug, int, 0);
138MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
139
140#define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
141 delay-time from dip-switches */
142static int heartbeat = WATCHDOG_HEARTBEAT;
143module_param(heartbeat, int, 0);
144MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
145 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
146 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
147
148static int nowayout = WATCHDOG_NOWAYOUT;
149module_param(nowayout, int, 0);
150MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
151 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
152
153/*
154 * Internal functions
155 */
156
157static int send_command(int cmd, int *msb, int *lsb)
158{
159 int got_response, count;
160
161 if (debug >= DEBUG)
162 printk(KERN_DEBUG PFX "sending following data "
163 "cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb);
164
165 spin_lock(&pcipcwd_private.io_lock);
166 /* If a command requires data it should be written first.
167 * Data for commands with 8 bits of data should be written to port 4.
168 * Commands with 16 bits of data, should be written as LSB to port 4
169 * and MSB to port 5.
170 * After the required data has been written then write the command to
171 * port 6. */
172 outb_p(*lsb, pcipcwd_private.io_addr + 4);
173 outb_p(*msb, pcipcwd_private.io_addr + 5);
174 outb_p(cmd, pcipcwd_private.io_addr + 6);
175
176 /* wait till the pci card processed the command, signaled by
177 * the WRSP bit in port 2 and give it a max. timeout of
178 * PCI_COMMAND_TIMEOUT to process */
179 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
180 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
181 count++) {
182 mdelay(1);
183 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
184 }
185
186 if (debug >= DEBUG) {
187 if (got_response) {
188 printk(KERN_DEBUG PFX
189 "time to process command was: %d ms\n",
190 count);
191 } else {
192 printk(KERN_DEBUG PFX
193 "card did not respond on command!\n");
194 }
195 }
196
197 if (got_response) {
198 /* read back response */
199 *lsb = inb_p(pcipcwd_private.io_addr + 4);
200 *msb = inb_p(pcipcwd_private.io_addr + 5);
201
202 /* clear WRSP bit */
203 inb_p(pcipcwd_private.io_addr + 6);
204
205 if (debug >= DEBUG)
206 printk(KERN_DEBUG PFX "received following data for "
207 "cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
208 cmd, *msb, *lsb);
209 }
210
211 spin_unlock(&pcipcwd_private.io_lock);
212
213 return got_response;
214}
215
216static inline void pcipcwd_check_temperature_support(void)
217{
218 if (inb_p(pcipcwd_private.io_addr) != 0xF0)
219 pcipcwd_private.supports_temp = 1;
220}
221
222static int pcipcwd_get_option_switches(void)
223{
224 int option_switches;
225
226 option_switches = inb_p(pcipcwd_private.io_addr + 3);
227 return option_switches;
228}
229
230static void pcipcwd_show_card_info(void)
231{
232 int got_fw_rev, fw_rev_major, fw_rev_minor;
233 char fw_ver_str[20]; /* The cards firmware version */
234 int option_switches;
235
236 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
237 &fw_rev_minor);
238 if (got_fw_rev)
239 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
240 else
241 sprintf(fw_ver_str, "<card no answer>");
242
243 /* Get switch settings */
244 option_switches = pcipcwd_get_option_switches();
245
246 printk(KERN_INFO PFX "Found card at port "
247 "0x%04x (Firmware: %s) %s temp option\n",
248 (int) pcipcwd_private.io_addr, fw_ver_str,
249 (pcipcwd_private.supports_temp ? "with" : "without"));
250
251 printk(KERN_INFO PFX "Option switches (0x%02x): "
252 "Temperature Reset Enable=%s, Power On Delay=%s\n",
253 option_switches,
254 ((option_switches & 0x10) ? "ON" : "OFF"),
255 ((option_switches & 0x08) ? "ON" : "OFF"));
256
257 if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
258 printk(KERN_INFO PFX
259 "Previous reset was caused by the Watchdog card\n");
260
261 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
262 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
263
264 if (pcipcwd_private.boot_status == 0)
265 printk(KERN_INFO PFX
266 "No previous trip detected - Cold boot or reset\n");
267}
268
269static int pcipcwd_start(void)
270{
271 int stat_reg;
272
273 spin_lock(&pcipcwd_private.io_lock);
274 outb_p(0x00, pcipcwd_private.io_addr + 3);
275 udelay(1000);
276
277 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
278 spin_unlock(&pcipcwd_private.io_lock);
279
280 if (stat_reg & WD_PCI_WDIS) {
281 printk(KERN_ERR PFX "Card timer not enabled\n");
282 return -1;
283 }
284
285 if (debug >= VERBOSE)
286 printk(KERN_DEBUG PFX "Watchdog started\n");
287
288 return 0;
289}
290
291static int pcipcwd_stop(void)
292{
293 int stat_reg;
294
295 spin_lock(&pcipcwd_private.io_lock);
296 outb_p(0xA5, pcipcwd_private.io_addr + 3);
297 udelay(1000);
298
299 outb_p(0xA5, pcipcwd_private.io_addr + 3);
300 udelay(1000);
301
302 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
303 spin_unlock(&pcipcwd_private.io_lock);
304
305 if (!(stat_reg & WD_PCI_WDIS)) {
306 printk(KERN_ERR PFX
307 "Card did not acknowledge disable attempt\n");
308 return -1;
309 }
310
311 if (debug >= VERBOSE)
312 printk(KERN_DEBUG PFX "Watchdog stopped\n");
313
314 return 0;
315}
316
317static int pcipcwd_keepalive(void)
318{
319 /* Re-trigger watchdog by writing to port 0 */
320 spin_lock(&pcipcwd_private.io_lock);
321 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
322 spin_unlock(&pcipcwd_private.io_lock);
323
324 if (debug >= DEBUG)
325 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
326
327 return 0;
328}
329
330static int pcipcwd_set_heartbeat(int t)
331{
332 int t_msb = t / 256;
333 int t_lsb = t % 256;
334
335 if ((t < 0x0001) || (t > 0xFFFF))
336 return -EINVAL;
337
338 /* Write new heartbeat to watchdog */
339 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
340
341 heartbeat = t;
342 if (debug >= VERBOSE)
343 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
344 heartbeat);
345
346 return 0;
347}
348
349static int pcipcwd_get_status(int *status)
350{
351 int control_status;
352
353 *status = 0;
354 control_status = inb_p(pcipcwd_private.io_addr + 1);
355 if (control_status & WD_PCI_WTRP)
356 *status |= WDIOF_CARDRESET;
357 if (control_status & WD_PCI_TTRP) {
358 *status |= WDIOF_OVERHEAT;
359 if (temp_panic)
360 panic(PFX "Temperature overheat trip!\n");
361 }
362
363 if (debug >= DEBUG)
364 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
365 control_status);
366
367 return 0;
368}
369
370static int pcipcwd_clear_status(void)
371{
372 int control_status;
373 int msb;
374 int reset_counter;
375
376 if (debug >= VERBOSE)
377 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
378
379 control_status = inb_p(pcipcwd_private.io_addr + 1);
380
381 if (debug >= DEBUG) {
382 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
383 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
384 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
385 }
386
387 /* clear trip status & LED and keep mode of relay 2 */
388 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
389 pcipcwd_private.io_addr + 1);
390
391 /* clear reset counter */
392 msb = 0;
393 reset_counter = 0xff;
394 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
395
396 if (debug >= DEBUG) {
397 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
398 reset_counter);
399 }
400
401 return 0;
402}
403
404static int pcipcwd_get_temperature(int *temperature)
405{
406 *temperature = 0;
407 if (!pcipcwd_private.supports_temp)
408 return -ENODEV;
409
410 spin_lock(&pcipcwd_private.io_lock);
411 *temperature = inb_p(pcipcwd_private.io_addr);
412 spin_unlock(&pcipcwd_private.io_lock);
413
414 /*
415 * Convert celsius to fahrenheit, since this was
416 * the decided 'standard' for this return value.
417 */
418 *temperature = (*temperature * 9 / 5) + 32;
419
420 if (debug >= DEBUG) {
421 printk(KERN_DEBUG PFX "temperature is: %d F\n",
422 *temperature);
423 }
424
425 return 0;
426}
427
428static int pcipcwd_get_timeleft(int *time_left)
429{
430 int msb;
431 int lsb;
432
433 /* Read the time that's left before rebooting */
434 /* Note: if the board is not yet armed then we will read 0xFFFF */
435 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
436
437 *time_left = (msb << 8) + lsb;
438
439 if (debug >= VERBOSE)
440 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
441 *time_left);
442
443 return 0;
444}
445
446/*
447 * /dev/watchdog handling
448 */
449
450static ssize_t pcipcwd_write(struct file *file, const char __user *data,
451 size_t len, loff_t *ppos)
452{
453 /* See if we got the magic character 'V' and reload the timer */
454 if (len) {
455 if (!nowayout) {
456 size_t i;
457
458 /* note: just in case someone wrote the magic character
459 * five months ago... */
460 expect_release = 0;
461
462 /* scan to see whether or not we got the
463 * magic character */
464 for (i = 0; i != len; i++) {
465 char c;
466 if (get_user(c, data + i))
467 return -EFAULT;
468 if (c == 'V')
469 expect_release = 42;
470 }
471 }
472
473 /* someone wrote to us, we should reload the timer */
474 pcipcwd_keepalive();
475 }
476 return len;
477}
478
479static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
480 unsigned long arg)
481{
482 void __user *argp = (void __user *)arg;
483 int __user *p = argp;
484 static const struct watchdog_info ident = {
485 .options = WDIOF_OVERHEAT |
486 WDIOF_CARDRESET |
487 WDIOF_KEEPALIVEPING |
488 WDIOF_SETTIMEOUT |
489 WDIOF_MAGICCLOSE,
490 .firmware_version = 1,
491 .identity = WATCHDOG_DRIVER_NAME,
492 };
493
494 switch (cmd) {
495 case WDIOC_GETSUPPORT:
496 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
497
498 case WDIOC_GETSTATUS:
499 {
500 int status;
501 pcipcwd_get_status(&status);
502 return put_user(status, p);
503 }
504
505 case WDIOC_GETBOOTSTATUS:
506 return put_user(pcipcwd_private.boot_status, p);
507
508 case WDIOC_GETTEMP:
509 {
510 int temperature;
511
512 if (pcipcwd_get_temperature(&temperature))
513 return -EFAULT;
514
515 return put_user(temperature, p);
516 }
517
518 case WDIOC_SETOPTIONS:
519 {
520 int new_options, retval = -EINVAL;
521
522 if (get_user(new_options, p))
523 return -EFAULT;
524
525 if (new_options & WDIOS_DISABLECARD) {
526 if (pcipcwd_stop())
527 return -EIO;
528 retval = 0;
529 }
530
531 if (new_options & WDIOS_ENABLECARD) {
532 if (pcipcwd_start())
533 return -EIO;
534 retval = 0;
535 }
536
537 if (new_options & WDIOS_TEMPPANIC) {
538 temp_panic = 1;
539 retval = 0;
540 }
541
542 return retval;
543 }
544
545 case WDIOC_KEEPALIVE:
546 pcipcwd_keepalive();
547 return 0;
548
549 case WDIOC_SETTIMEOUT:
550 {
551 int new_heartbeat;
552
553 if (get_user(new_heartbeat, p))
554 return -EFAULT;
555
556 if (pcipcwd_set_heartbeat(new_heartbeat))
557 return -EINVAL;
558
559 pcipcwd_keepalive();
560 /* Fall */
561 }
562
563 case WDIOC_GETTIMEOUT:
564 return put_user(heartbeat, p);
565
566 case WDIOC_GETTIMELEFT:
567 {
568 int time_left;
569
570 if (pcipcwd_get_timeleft(&time_left))
571 return -EFAULT;
572
573 return put_user(time_left, p);
574 }
575
576 default:
577 return -ENOTTY;
578 }
579}
580
581static int pcipcwd_open(struct inode *inode, struct file *file)
582{
583 /* /dev/watchdog can only be opened once */
584 if (test_and_set_bit(0, &is_active)) {
585 if (debug >= VERBOSE)
586 printk(KERN_ERR PFX
587 "Attempt to open already opened device.\n");
588 return -EBUSY;
589 }
590
591 /* Activate */
592 pcipcwd_start();
593 pcipcwd_keepalive();
594 return nonseekable_open(inode, file);
595}
596
597static int pcipcwd_release(struct inode *inode, struct file *file)
598{
599 /*
600 * Shut off the timer.
601 */
602 if (expect_release == 42) {
603 pcipcwd_stop();
604 } else {
605 printk(KERN_CRIT PFX
606 "Unexpected close, not stopping watchdog!\n");
607 pcipcwd_keepalive();
608 }
609 expect_release = 0;
610 clear_bit(0, &is_active);
611 return 0;
612}
613
614/*
615 * /dev/temperature handling
616 */
617
618static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
619 size_t len, loff_t *ppos)
620{
621 int temperature;
622
623 if (pcipcwd_get_temperature(&temperature))
624 return -EFAULT;
625
626 if (copy_to_user(data, &temperature, 1))
627 return -EFAULT;
628
629 return 1;
630}
631
632static int pcipcwd_temp_open(struct inode *inode, struct file *file)
633{
634 if (!pcipcwd_private.supports_temp)
635 return -ENODEV;
636
637 return nonseekable_open(inode, file);
638}
639
640static int pcipcwd_temp_release(struct inode *inode, struct file *file)
641{
642 return 0;
643}
644
645/*
646 * Notify system
647 */
648
649static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
650 void *unused)
651{
652 if (code == SYS_DOWN || code == SYS_HALT)
653 pcipcwd_stop(); /* Turn the WDT off */
654
655 return NOTIFY_DONE;
656}
657
658/*
659 * Kernel Interfaces
660 */
661
662static const struct file_operations pcipcwd_fops = {
663 .owner = THIS_MODULE,
664 .llseek = no_llseek,
665 .write = pcipcwd_write,
666 .unlocked_ioctl = pcipcwd_ioctl,
667 .open = pcipcwd_open,
668 .release = pcipcwd_release,
669};
670
671static struct miscdevice pcipcwd_miscdev = {
672 .minor = WATCHDOG_MINOR,
673 .name = "watchdog",
674 .fops = &pcipcwd_fops,
675};
676
677static const struct file_operations pcipcwd_temp_fops = {
678 .owner = THIS_MODULE,
679 .llseek = no_llseek,
680 .read = pcipcwd_temp_read,
681 .open = pcipcwd_temp_open,
682 .release = pcipcwd_temp_release,
683};
684
685static struct miscdevice pcipcwd_temp_miscdev = {
686 .minor = TEMP_MINOR,
687 .name = "temperature",
688 .fops = &pcipcwd_temp_fops,
689};
690
691static struct notifier_block pcipcwd_notifier = {
692 .notifier_call = pcipcwd_notify_sys,
693};
694
695/*
696 * Init & exit routines
697 */
698
699static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
700 const struct pci_device_id *ent)
701{
702 int ret = -EIO;
703
704 cards_found++;
705 if (cards_found == 1)
706 printk(KERN_INFO PFX DRIVER_VERSION);
707
708 if (cards_found > 1) {
709 printk(KERN_ERR PFX "This driver only supports 1 device\n");
710 return -ENODEV;
711 }
712
713 if (pci_enable_device(pdev)) {
714 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
715 return -ENODEV;
716 }
717
718 if (pci_resource_start(pdev, 0) == 0x0000) {
719 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
720 ret = -ENODEV;
721 goto err_out_disable_device;
722 }
723
724 pcipcwd_private.pdev = pdev;
725 pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
726
727 if (pci_request_regions(pdev, WATCHDOG_NAME)) {
728 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
729 (int) pcipcwd_private.io_addr);
730 ret = -EIO;
731 goto err_out_disable_device;
732 }
733
734 /* get the boot_status */
735 pcipcwd_get_status(&pcipcwd_private.boot_status);
736
737 /* clear the "card caused reboot" flag */
738 pcipcwd_clear_status();
739
740 /* disable card */
741 pcipcwd_stop();
742
743 /* Check whether or not the card supports the temperature device */
744 pcipcwd_check_temperature_support();
745
746 /* Show info about the card itself */
747 pcipcwd_show_card_info();
748
749 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
750 if (heartbeat == 0)
751 heartbeat =
752 heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
753
754 /* Check that the heartbeat value is within it's range ;
755 * if not reset to the default */
756 if (pcipcwd_set_heartbeat(heartbeat)) {
757 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
758 printk(KERN_INFO PFX
759 "heartbeat value must be 0<heartbeat<65536, using %d\n",
760 WATCHDOG_HEARTBEAT);
761 }
762
763 ret = register_reboot_notifier(&pcipcwd_notifier);
764 if (ret != 0) {
765 printk(KERN_ERR PFX
766 "cannot register reboot notifier (err=%d)\n", ret);
767 goto err_out_release_region;
768 }
769
770 if (pcipcwd_private.supports_temp) {
771 ret = misc_register(&pcipcwd_temp_miscdev);
772 if (ret != 0) {
773 printk(KERN_ERR PFX "cannot register miscdev on "
774 "minor=%d (err=%d)\n", TEMP_MINOR, ret);
775 goto err_out_unregister_reboot;
776 }
777 }
778
779 ret = misc_register(&pcipcwd_miscdev);
780 if (ret != 0) {
781 printk(KERN_ERR PFX
782 "cannot register miscdev on minor=%d (err=%d)\n",
783 WATCHDOG_MINOR, ret);
784 goto err_out_misc_deregister;
785 }
786
787 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
788 heartbeat, nowayout);
789
790 return 0;
791
792err_out_misc_deregister:
793 if (pcipcwd_private.supports_temp)
794 misc_deregister(&pcipcwd_temp_miscdev);
795err_out_unregister_reboot:
796 unregister_reboot_notifier(&pcipcwd_notifier);
797err_out_release_region:
798 pci_release_regions(pdev);
799err_out_disable_device:
800 pci_disable_device(pdev);
801 return ret;
802}
803
804static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
805{
806 /* Stop the timer before we leave */
807 if (!nowayout)
808 pcipcwd_stop();
809
810 /* Deregister */
811 misc_deregister(&pcipcwd_miscdev);
812 if (pcipcwd_private.supports_temp)
813 misc_deregister(&pcipcwd_temp_miscdev);
814 unregister_reboot_notifier(&pcipcwd_notifier);
815 pci_release_regions(pdev);
816 pci_disable_device(pdev);
817 cards_found--;
818}
819
820static DEFINE_PCI_DEVICE_TABLE(pcipcwd_pci_tbl) = {
821 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
822 PCI_ANY_ID, PCI_ANY_ID, },
823 { 0 }, /* End of list */
824};
825MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
826
827static struct pci_driver pcipcwd_driver = {
828 .name = WATCHDOG_NAME,
829 .id_table = pcipcwd_pci_tbl,
830 .probe = pcipcwd_card_init,
831 .remove = __devexit_p(pcipcwd_card_exit),
832};
833
834static int __init pcipcwd_init_module(void)
835{
836 spin_lock_init(&pcipcwd_private.io_lock);
837
838 return pci_register_driver(&pcipcwd_driver);
839}
840
841static void __exit pcipcwd_cleanup_module(void)
842{
843 pci_unregister_driver(&pcipcwd_driver);
844
845 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
846}
847
848module_init(pcipcwd_init_module);
849module_exit(pcipcwd_cleanup_module);
850
851MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
852MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
853MODULE_LICENSE("GPL");
854MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
855MODULE_ALIAS_MISCDEV(TEMP_MINOR);
1/*
2 * Berkshire PCI-PC Watchdog Card Driver
3 *
4 * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
5 *
6 * Based on source code of the following authors:
7 * Ken Hollis <kenji@bitgate.com>,
8 * Lindsay Harris <lindsay@bluegum.com>,
9 * Alan Cox <alan@lxorguk.ukuu.org.uk>,
10 * Matt Domsch <Matt_Domsch@dell.com>,
11 * Rob Radez <rob@osinvestor.com>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
19 * provide warranty for any of this software. This material is
20 * provided "AS-IS" and at no charge.
21 */
22
23/*
24 * A bells and whistles driver is available from:
25 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
26 *
27 * More info available at
28 * http://www.berkprod.com/ or http://www.pcwatchdog.com/
29 */
30
31/*
32 * Includes, defines, variables, module parameters, ...
33 */
34
35#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
36
37#include <linux/module.h> /* For module specific items */
38#include <linux/moduleparam.h> /* For new moduleparam's */
39#include <linux/types.h> /* For standard types (like size_t) */
40#include <linux/errno.h> /* For the -ENODEV/... values */
41#include <linux/kernel.h> /* For printk/panic/... */
42#include <linux/delay.h> /* For mdelay function */
43#include <linux/miscdevice.h> /* For struct miscdevice */
44#include <linux/watchdog.h> /* For the watchdog specific items */
45#include <linux/notifier.h> /* For notifier support */
46#include <linux/reboot.h> /* For reboot_notifier stuff */
47#include <linux/init.h> /* For __init/__exit/... */
48#include <linux/fs.h> /* For file operations */
49#include <linux/pci.h> /* For pci functions */
50#include <linux/ioport.h> /* For io-port access */
51#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
52#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
53#include <linux/io.h> /* For inb/outb/... */
54
55/* Module and version information */
56#define WATCHDOG_VERSION "1.03"
57#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
58#define WATCHDOG_NAME "pcwd_pci"
59#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION
60
61/* Stuff for the PCI ID's */
62#ifndef PCI_VENDOR_ID_QUICKLOGIC
63#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3
64#endif
65
66#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
67#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
68#endif
69
70/*
71 * These are the defines that describe the control status bits for the
72 * PCI-PC Watchdog card.
73 */
74/* Port 1 : Control Status #1 */
75#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */
76#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */
77#define WD_PCI_TTRP 0x04 /* Temperature Trip status */
78#define WD_PCI_RL2A 0x08 /* Relay 2 Active */
79#define WD_PCI_RL1A 0x10 /* Relay 1 Active */
80#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip /
81 reset */
82#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */
83/* Port 2 : Control Status #2 */
84#define WD_PCI_WDIS 0x10 /* Watchdog Disable */
85#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */
86#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */
87#define WD_PCI_PCMD 0x80 /* PC has sent command */
88
89/* according to documentation max. time to process a command for the pci
90 * watchdog card is 100 ms, so we give it 150 ms to do it's job */
91#define PCI_COMMAND_TIMEOUT 150
92
93/* Watchdog's internal commands */
94#define CMD_GET_STATUS 0x04
95#define CMD_GET_FIRMWARE_VERSION 0x08
96#define CMD_READ_WATCHDOG_TIMEOUT 0x18
97#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19
98#define CMD_GET_CLEAR_RESET_COUNT 0x84
99
100/* Watchdog's Dip Switch heartbeat values */
101static const int heartbeat_tbl[] = {
102 5, /* OFF-OFF-OFF = 5 Sec */
103 10, /* OFF-OFF-ON = 10 Sec */
104 30, /* OFF-ON-OFF = 30 Sec */
105 60, /* OFF-ON-ON = 1 Min */
106 300, /* ON-OFF-OFF = 5 Min */
107 600, /* ON-OFF-ON = 10 Min */
108 1800, /* ON-ON-OFF = 30 Min */
109 3600, /* ON-ON-ON = 1 hour */
110};
111
112/* We can only use 1 card due to the /dev/watchdog restriction */
113static int cards_found;
114
115/* internal variables */
116static int temp_panic;
117static unsigned long is_active;
118static char expect_release;
119/* this is private data for each PCI-PC watchdog card */
120static struct {
121 /* Wether or not the card has a temperature device */
122 int supports_temp;
123 /* The card's boot status */
124 int boot_status;
125 /* The cards I/O address */
126 unsigned long io_addr;
127 /* the lock for io operations */
128 spinlock_t io_lock;
129 /* the PCI-device */
130 struct pci_dev *pdev;
131} pcipcwd_private;
132
133/* module parameters */
134#define QUIET 0 /* Default */
135#define VERBOSE 1 /* Verbose */
136#define DEBUG 2 /* print fancy stuff too */
137static int debug = QUIET;
138module_param(debug, int, 0);
139MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
140
141#define WATCHDOG_HEARTBEAT 0 /* default heartbeat =
142 delay-time from dip-switches */
143static int heartbeat = WATCHDOG_HEARTBEAT;
144module_param(heartbeat, int, 0);
145MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
146 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
147 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
148
149static bool nowayout = WATCHDOG_NOWAYOUT;
150module_param(nowayout, bool, 0);
151MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
152 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
153
154/*
155 * Internal functions
156 */
157
158static int send_command(int cmd, int *msb, int *lsb)
159{
160 int got_response, count;
161
162 if (debug >= DEBUG)
163 pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
164 cmd, *msb, *lsb);
165
166 spin_lock(&pcipcwd_private.io_lock);
167 /* If a command requires data it should be written first.
168 * Data for commands with 8 bits of data should be written to port 4.
169 * Commands with 16 bits of data, should be written as LSB to port 4
170 * and MSB to port 5.
171 * After the required data has been written then write the command to
172 * port 6. */
173 outb_p(*lsb, pcipcwd_private.io_addr + 4);
174 outb_p(*msb, pcipcwd_private.io_addr + 5);
175 outb_p(cmd, pcipcwd_private.io_addr + 6);
176
177 /* wait till the pci card processed the command, signaled by
178 * the WRSP bit in port 2 and give it a max. timeout of
179 * PCI_COMMAND_TIMEOUT to process */
180 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
181 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
182 count++) {
183 mdelay(1);
184 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
185 }
186
187 if (debug >= DEBUG) {
188 if (got_response) {
189 pr_debug("time to process command was: %d ms\n",
190 count);
191 } else {
192 pr_debug("card did not respond on command!\n");
193 }
194 }
195
196 if (got_response) {
197 /* read back response */
198 *lsb = inb_p(pcipcwd_private.io_addr + 4);
199 *msb = inb_p(pcipcwd_private.io_addr + 5);
200
201 /* clear WRSP bit */
202 inb_p(pcipcwd_private.io_addr + 6);
203
204 if (debug >= DEBUG)
205 pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
206 cmd, *msb, *lsb);
207 }
208
209 spin_unlock(&pcipcwd_private.io_lock);
210
211 return got_response;
212}
213
214static inline void pcipcwd_check_temperature_support(void)
215{
216 if (inb_p(pcipcwd_private.io_addr) != 0xF0)
217 pcipcwd_private.supports_temp = 1;
218}
219
220static int pcipcwd_get_option_switches(void)
221{
222 int option_switches;
223
224 option_switches = inb_p(pcipcwd_private.io_addr + 3);
225 return option_switches;
226}
227
228static void pcipcwd_show_card_info(void)
229{
230 int got_fw_rev, fw_rev_major, fw_rev_minor;
231 char fw_ver_str[20]; /* The cards firmware version */
232 int option_switches;
233
234 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
235 &fw_rev_minor);
236 if (got_fw_rev)
237 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
238 else
239 sprintf(fw_ver_str, "<card no answer>");
240
241 /* Get switch settings */
242 option_switches = pcipcwd_get_option_switches();
243
244 pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n",
245 (int) pcipcwd_private.io_addr, fw_ver_str,
246 (pcipcwd_private.supports_temp ? "with" : "without"));
247
248 pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
249 option_switches,
250 ((option_switches & 0x10) ? "ON" : "OFF"),
251 ((option_switches & 0x08) ? "ON" : "OFF"));
252
253 if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
254 pr_info("Previous reset was caused by the Watchdog card\n");
255
256 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
257 pr_info("Card sensed a CPU Overheat\n");
258
259 if (pcipcwd_private.boot_status == 0)
260 pr_info("No previous trip detected - Cold boot or reset\n");
261}
262
263static int pcipcwd_start(void)
264{
265 int stat_reg;
266
267 spin_lock(&pcipcwd_private.io_lock);
268 outb_p(0x00, pcipcwd_private.io_addr + 3);
269 udelay(1000);
270
271 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
272 spin_unlock(&pcipcwd_private.io_lock);
273
274 if (stat_reg & WD_PCI_WDIS) {
275 pr_err("Card timer not enabled\n");
276 return -1;
277 }
278
279 if (debug >= VERBOSE)
280 pr_debug("Watchdog started\n");
281
282 return 0;
283}
284
285static int pcipcwd_stop(void)
286{
287 int stat_reg;
288
289 spin_lock(&pcipcwd_private.io_lock);
290 outb_p(0xA5, pcipcwd_private.io_addr + 3);
291 udelay(1000);
292
293 outb_p(0xA5, pcipcwd_private.io_addr + 3);
294 udelay(1000);
295
296 stat_reg = inb_p(pcipcwd_private.io_addr + 2);
297 spin_unlock(&pcipcwd_private.io_lock);
298
299 if (!(stat_reg & WD_PCI_WDIS)) {
300 pr_err("Card did not acknowledge disable attempt\n");
301 return -1;
302 }
303
304 if (debug >= VERBOSE)
305 pr_debug("Watchdog stopped\n");
306
307 return 0;
308}
309
310static int pcipcwd_keepalive(void)
311{
312 /* Re-trigger watchdog by writing to port 0 */
313 spin_lock(&pcipcwd_private.io_lock);
314 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */
315 spin_unlock(&pcipcwd_private.io_lock);
316
317 if (debug >= DEBUG)
318 pr_debug("Watchdog keepalive signal send\n");
319
320 return 0;
321}
322
323static int pcipcwd_set_heartbeat(int t)
324{
325 int t_msb = t / 256;
326 int t_lsb = t % 256;
327
328 if ((t < 0x0001) || (t > 0xFFFF))
329 return -EINVAL;
330
331 /* Write new heartbeat to watchdog */
332 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
333
334 heartbeat = t;
335 if (debug >= VERBOSE)
336 pr_debug("New heartbeat: %d\n", heartbeat);
337
338 return 0;
339}
340
341static int pcipcwd_get_status(int *status)
342{
343 int control_status;
344
345 *status = 0;
346 control_status = inb_p(pcipcwd_private.io_addr + 1);
347 if (control_status & WD_PCI_WTRP)
348 *status |= WDIOF_CARDRESET;
349 if (control_status & WD_PCI_TTRP) {
350 *status |= WDIOF_OVERHEAT;
351 if (temp_panic)
352 panic(KBUILD_MODNAME ": Temperature overheat trip!\n");
353 }
354
355 if (debug >= DEBUG)
356 pr_debug("Control Status #1: 0x%02x\n", control_status);
357
358 return 0;
359}
360
361static int pcipcwd_clear_status(void)
362{
363 int control_status;
364 int msb;
365 int reset_counter;
366
367 if (debug >= VERBOSE)
368 pr_info("clearing watchdog trip status & LED\n");
369
370 control_status = inb_p(pcipcwd_private.io_addr + 1);
371
372 if (debug >= DEBUG) {
373 pr_debug("status was: 0x%02x\n", control_status);
374 pr_debug("sending: 0x%02x\n",
375 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
376 }
377
378 /* clear trip status & LED and keep mode of relay 2 */
379 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
380 pcipcwd_private.io_addr + 1);
381
382 /* clear reset counter */
383 msb = 0;
384 reset_counter = 0xff;
385 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
386
387 if (debug >= DEBUG) {
388 pr_debug("reset count was: 0x%02x\n", reset_counter);
389 }
390
391 return 0;
392}
393
394static int pcipcwd_get_temperature(int *temperature)
395{
396 *temperature = 0;
397 if (!pcipcwd_private.supports_temp)
398 return -ENODEV;
399
400 spin_lock(&pcipcwd_private.io_lock);
401 *temperature = inb_p(pcipcwd_private.io_addr);
402 spin_unlock(&pcipcwd_private.io_lock);
403
404 /*
405 * Convert celsius to fahrenheit, since this was
406 * the decided 'standard' for this return value.
407 */
408 *temperature = (*temperature * 9 / 5) + 32;
409
410 if (debug >= DEBUG) {
411 pr_debug("temperature is: %d F\n", *temperature);
412 }
413
414 return 0;
415}
416
417static int pcipcwd_get_timeleft(int *time_left)
418{
419 int msb;
420 int lsb;
421
422 /* Read the time that's left before rebooting */
423 /* Note: if the board is not yet armed then we will read 0xFFFF */
424 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
425
426 *time_left = (msb << 8) + lsb;
427
428 if (debug >= VERBOSE)
429 pr_debug("Time left before next reboot: %d\n", *time_left);
430
431 return 0;
432}
433
434/*
435 * /dev/watchdog handling
436 */
437
438static ssize_t pcipcwd_write(struct file *file, const char __user *data,
439 size_t len, loff_t *ppos)
440{
441 /* See if we got the magic character 'V' and reload the timer */
442 if (len) {
443 if (!nowayout) {
444 size_t i;
445
446 /* note: just in case someone wrote the magic character
447 * five months ago... */
448 expect_release = 0;
449
450 /* scan to see whether or not we got the
451 * magic character */
452 for (i = 0; i != len; i++) {
453 char c;
454 if (get_user(c, data + i))
455 return -EFAULT;
456 if (c == 'V')
457 expect_release = 42;
458 }
459 }
460
461 /* someone wrote to us, we should reload the timer */
462 pcipcwd_keepalive();
463 }
464 return len;
465}
466
467static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
468 unsigned long arg)
469{
470 void __user *argp = (void __user *)arg;
471 int __user *p = argp;
472 static const struct watchdog_info ident = {
473 .options = WDIOF_OVERHEAT |
474 WDIOF_CARDRESET |
475 WDIOF_KEEPALIVEPING |
476 WDIOF_SETTIMEOUT |
477 WDIOF_MAGICCLOSE,
478 .firmware_version = 1,
479 .identity = WATCHDOG_DRIVER_NAME,
480 };
481
482 switch (cmd) {
483 case WDIOC_GETSUPPORT:
484 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
485
486 case WDIOC_GETSTATUS:
487 {
488 int status;
489 pcipcwd_get_status(&status);
490 return put_user(status, p);
491 }
492
493 case WDIOC_GETBOOTSTATUS:
494 return put_user(pcipcwd_private.boot_status, p);
495
496 case WDIOC_GETTEMP:
497 {
498 int temperature;
499
500 if (pcipcwd_get_temperature(&temperature))
501 return -EFAULT;
502
503 return put_user(temperature, p);
504 }
505
506 case WDIOC_SETOPTIONS:
507 {
508 int new_options, retval = -EINVAL;
509
510 if (get_user(new_options, p))
511 return -EFAULT;
512
513 if (new_options & WDIOS_DISABLECARD) {
514 if (pcipcwd_stop())
515 return -EIO;
516 retval = 0;
517 }
518
519 if (new_options & WDIOS_ENABLECARD) {
520 if (pcipcwd_start())
521 return -EIO;
522 retval = 0;
523 }
524
525 if (new_options & WDIOS_TEMPPANIC) {
526 temp_panic = 1;
527 retval = 0;
528 }
529
530 return retval;
531 }
532
533 case WDIOC_KEEPALIVE:
534 pcipcwd_keepalive();
535 return 0;
536
537 case WDIOC_SETTIMEOUT:
538 {
539 int new_heartbeat;
540
541 if (get_user(new_heartbeat, p))
542 return -EFAULT;
543
544 if (pcipcwd_set_heartbeat(new_heartbeat))
545 return -EINVAL;
546
547 pcipcwd_keepalive();
548 }
549 /* fall through */
550
551 case WDIOC_GETTIMEOUT:
552 return put_user(heartbeat, p);
553
554 case WDIOC_GETTIMELEFT:
555 {
556 int time_left;
557
558 if (pcipcwd_get_timeleft(&time_left))
559 return -EFAULT;
560
561 return put_user(time_left, p);
562 }
563
564 default:
565 return -ENOTTY;
566 }
567}
568
569static int pcipcwd_open(struct inode *inode, struct file *file)
570{
571 /* /dev/watchdog can only be opened once */
572 if (test_and_set_bit(0, &is_active)) {
573 if (debug >= VERBOSE)
574 pr_err("Attempt to open already opened device\n");
575 return -EBUSY;
576 }
577
578 /* Activate */
579 pcipcwd_start();
580 pcipcwd_keepalive();
581 return nonseekable_open(inode, file);
582}
583
584static int pcipcwd_release(struct inode *inode, struct file *file)
585{
586 /*
587 * Shut off the timer.
588 */
589 if (expect_release == 42) {
590 pcipcwd_stop();
591 } else {
592 pr_crit("Unexpected close, not stopping watchdog!\n");
593 pcipcwd_keepalive();
594 }
595 expect_release = 0;
596 clear_bit(0, &is_active);
597 return 0;
598}
599
600/*
601 * /dev/temperature handling
602 */
603
604static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
605 size_t len, loff_t *ppos)
606{
607 int temperature;
608
609 if (pcipcwd_get_temperature(&temperature))
610 return -EFAULT;
611
612 if (copy_to_user(data, &temperature, 1))
613 return -EFAULT;
614
615 return 1;
616}
617
618static int pcipcwd_temp_open(struct inode *inode, struct file *file)
619{
620 if (!pcipcwd_private.supports_temp)
621 return -ENODEV;
622
623 return nonseekable_open(inode, file);
624}
625
626static int pcipcwd_temp_release(struct inode *inode, struct file *file)
627{
628 return 0;
629}
630
631/*
632 * Notify system
633 */
634
635static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
636 void *unused)
637{
638 if (code == SYS_DOWN || code == SYS_HALT)
639 pcipcwd_stop(); /* Turn the WDT off */
640
641 return NOTIFY_DONE;
642}
643
644/*
645 * Kernel Interfaces
646 */
647
648static const struct file_operations pcipcwd_fops = {
649 .owner = THIS_MODULE,
650 .llseek = no_llseek,
651 .write = pcipcwd_write,
652 .unlocked_ioctl = pcipcwd_ioctl,
653 .open = pcipcwd_open,
654 .release = pcipcwd_release,
655};
656
657static struct miscdevice pcipcwd_miscdev = {
658 .minor = WATCHDOG_MINOR,
659 .name = "watchdog",
660 .fops = &pcipcwd_fops,
661};
662
663static const struct file_operations pcipcwd_temp_fops = {
664 .owner = THIS_MODULE,
665 .llseek = no_llseek,
666 .read = pcipcwd_temp_read,
667 .open = pcipcwd_temp_open,
668 .release = pcipcwd_temp_release,
669};
670
671static struct miscdevice pcipcwd_temp_miscdev = {
672 .minor = TEMP_MINOR,
673 .name = "temperature",
674 .fops = &pcipcwd_temp_fops,
675};
676
677static struct notifier_block pcipcwd_notifier = {
678 .notifier_call = pcipcwd_notify_sys,
679};
680
681/*
682 * Init & exit routines
683 */
684
685static int pcipcwd_card_init(struct pci_dev *pdev,
686 const struct pci_device_id *ent)
687{
688 int ret = -EIO;
689
690 cards_found++;
691 if (cards_found == 1)
692 pr_info("%s\n", DRIVER_VERSION);
693
694 if (cards_found > 1) {
695 pr_err("This driver only supports 1 device\n");
696 return -ENODEV;
697 }
698
699 if (pci_enable_device(pdev)) {
700 pr_err("Not possible to enable PCI Device\n");
701 return -ENODEV;
702 }
703
704 if (pci_resource_start(pdev, 0) == 0x0000) {
705 pr_err("No I/O-Address for card detected\n");
706 ret = -ENODEV;
707 goto err_out_disable_device;
708 }
709
710 spin_lock_init(&pcipcwd_private.io_lock);
711 pcipcwd_private.pdev = pdev;
712 pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
713
714 if (pci_request_regions(pdev, WATCHDOG_NAME)) {
715 pr_err("I/O address 0x%04x already in use\n",
716 (int) pcipcwd_private.io_addr);
717 ret = -EIO;
718 goto err_out_disable_device;
719 }
720
721 /* get the boot_status */
722 pcipcwd_get_status(&pcipcwd_private.boot_status);
723
724 /* clear the "card caused reboot" flag */
725 pcipcwd_clear_status();
726
727 /* disable card */
728 pcipcwd_stop();
729
730 /* Check whether or not the card supports the temperature device */
731 pcipcwd_check_temperature_support();
732
733 /* Show info about the card itself */
734 pcipcwd_show_card_info();
735
736 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
737 if (heartbeat == 0)
738 heartbeat =
739 heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
740
741 /* Check that the heartbeat value is within it's range ;
742 * if not reset to the default */
743 if (pcipcwd_set_heartbeat(heartbeat)) {
744 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
745 pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
746 WATCHDOG_HEARTBEAT);
747 }
748
749 ret = register_reboot_notifier(&pcipcwd_notifier);
750 if (ret != 0) {
751 pr_err("cannot register reboot notifier (err=%d)\n", ret);
752 goto err_out_release_region;
753 }
754
755 if (pcipcwd_private.supports_temp) {
756 ret = misc_register(&pcipcwd_temp_miscdev);
757 if (ret != 0) {
758 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
759 TEMP_MINOR, ret);
760 goto err_out_unregister_reboot;
761 }
762 }
763
764 ret = misc_register(&pcipcwd_miscdev);
765 if (ret != 0) {
766 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
767 WATCHDOG_MINOR, ret);
768 goto err_out_misc_deregister;
769 }
770
771 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
772 heartbeat, nowayout);
773
774 return 0;
775
776err_out_misc_deregister:
777 if (pcipcwd_private.supports_temp)
778 misc_deregister(&pcipcwd_temp_miscdev);
779err_out_unregister_reboot:
780 unregister_reboot_notifier(&pcipcwd_notifier);
781err_out_release_region:
782 pci_release_regions(pdev);
783err_out_disable_device:
784 pci_disable_device(pdev);
785 return ret;
786}
787
788static void pcipcwd_card_exit(struct pci_dev *pdev)
789{
790 /* Stop the timer before we leave */
791 if (!nowayout)
792 pcipcwd_stop();
793
794 /* Deregister */
795 misc_deregister(&pcipcwd_miscdev);
796 if (pcipcwd_private.supports_temp)
797 misc_deregister(&pcipcwd_temp_miscdev);
798 unregister_reboot_notifier(&pcipcwd_notifier);
799 pci_release_regions(pdev);
800 pci_disable_device(pdev);
801 cards_found--;
802}
803
804static const struct pci_device_id pcipcwd_pci_tbl[] = {
805 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
806 PCI_ANY_ID, PCI_ANY_ID, },
807 { 0 }, /* End of list */
808};
809MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
810
811static struct pci_driver pcipcwd_driver = {
812 .name = WATCHDOG_NAME,
813 .id_table = pcipcwd_pci_tbl,
814 .probe = pcipcwd_card_init,
815 .remove = pcipcwd_card_exit,
816};
817
818module_pci_driver(pcipcwd_driver);
819
820MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
821MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
822MODULE_LICENSE("GPL");